JPH0546090A - Information retrieval system and navigation system - Google Patents

Abstract

PURPOSE:To add a new CD-ROM which is not incorporated in the system and incorporates it in the system. CONSTITUTION:When a magazine 1 is loaded in a CD-ROM driver 2, an MPU 6 stores a memory 9 with the cover area of the CD-ROM 21 put in the magazine 1. The current position of an automobile is detected by a GPS receiver 12 and supplied to the MPU 6. The MPU 6 retrieves a CD-ROM where a map including the current position is recorded by using the data stored in the memory 9 and loads the CD-ROM in the CD-ROM driver 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information retrieval system represented by a navigation system for guiding an automobile to a predetermined destination.

[0002]

2. Description of the Related Art In a conventional navigation system, map information is recorded in a CD-ROM, for example, and a map corresponding to the current position of the automobile is read from the CD-ROM and displayed on a CRT or the like. The driver can reach a predetermined destination on the unfamiliar land by looking at this map.

[0003]

By the way, the conventional navigation system has a CD installed in advance in the system.
-Only a ROM can be used, and a new CD-RO
There was a problem that it was not possible to add M. That is, the user can use the CD-RO prepared as a system in advance.
All Ms have to be purchased, and there is a problem that the CD-ROM in which the map information which is not incorporated in the system at the time of purchase cannot be used in the system.

The present invention has been made in view of such a situation, and makes it possible to add an information recording medium such as a CD-ROM to the system as needed.

[0005]

An information retrieval system according to a first aspect of the present invention is a memory for storing a range of information recorded on an information recording medium such as a CD-ROM and a storage position of the CD-ROM. 9 and when a new CD-ROM is added, the range of information recorded therein and the accommodation position of the CD-ROM are additionally stored in the memory 9.
For example, it is characterized in that it is provided with an additional storage means composed of MPU 6, for example.

In the navigation system according to the second aspect, a memory 9 as a storage means for storing the range of map information recorded on an information recording disk such as a CD-ROM and a new CD-ROM are added. When this is done, the range of the map information recorded in the added CD-ROM is additionally stored in the memory 9, for example MPU6.
And the like, a current position detecting means such as a GPS receiver 12 for detecting the current position of the vehicle, and map information including the current position C
It is characterized in that it is provided with a search means such as an MPU 7 for searching the D-ROM and a display means such as a display device 5 for displaying map information.

[0007]

In the information retrieving system according to the first aspect, when a new CD-ROM is added, the range of information recorded therein and the accommodating position of the CD-ROM are additionally stored. Therefore, a new CD-ROM can be installed in the system later.

In the navigation system of the second aspect, the map information of the newly added CD-ROM is read and displayed on the display device. Therefore, it is possible to add a new CD-ROM as needed and use the map information recorded therein to move to a predetermined destination.

[0009]

1 is a block diagram showing the configuration of an embodiment of a navigation system to which the information retrieval system of the present invention is applied. The magazine 1 contains a plurality (10 in this embodiment) of CD-ROMs 21a to 21j. The magazine 1 is attached to a CD-ROM driver 2 so that the data recorded in each CD-ROM can be reproduced. The signal processing circuit 3 processes the RF signal output from the CD-ROM driver 2 and outputs it to the image processing circuit 4. The image processing circuit 4 converts the reproduction data input from the signal processing circuit 3 into R,
The signals are converted into G and B primary color signals and supplied to the display device 5 including a CRT, LCD or the like for display.

The MPU 7 controls the CD-ROM driver 2 and a plurality of CD-ROMs 2 housed in the magazine 1.
Control is performed so that a predetermined one is selected from 1a to 21j. Further, it controls the signal processing circuit 3 to convert the RF signal output from the CD-ROM driver 2 into reproduction data. The MPU 6 controls each unit in response to a command input from the keyboard 8 to execute a navigation operation. The memory 9 stores necessary data under the control of the MPU 6. The detection device 10 is a CD-ROM of the magazine 1.
The mounting on the driver 2 is detected, and the detection signal is detected by the MPU6.
Output to. The GPS receiver 12 receives radio waves transmitted from GPS satellites via the antenna 11, detects the current position of the vehicle, and supplies the position information to the MPU 6.

FIG. 6 shows a CD-ROM 21 (21a to 2a).
1j) is shown. As shown in the figure, TOC information is recorded at the innermost circumferential position.
This TOC information includes information necessary to access the data recorded on the disc. T
A track (TRK) 1 is recorded on the outer periphery of the track on which OC information is recorded, and a TRK 2 is further recorded on the outer periphery thereof. At the beginning of TRK1, a disc label is recorded from 00 minutes, 02 seconds and 16 frames. And
Next to this disc label, normal map information is recorded. In addition, TRK2 records service file information. Audio data is recorded in this service file.

In addition, the information recorded in the CD-ROM 21 is summarized in Table 1. As is clear from this table, the CD-ROM has a plurality of pieces of information as map information following information such as a disc label, drawing parameters, leaf management information, index management information, card stack management information and service file management information. Is recorded. In addition, an index, an indexed information service, a service file (natural image), a service file (audio), etc. are recorded.

[Table 1]

Table 2 shows the contents of the disc label in Table 1. As shown in this table, the disc label records the system identification, the volume identification, etc. in addition to the volume structure identification, the volume structure version number, and the like. The volume identification is unique to each disk, and the difference between the disks can be discriminated from this volume identification.

[Table 2]

Table 3 shows the leaf management information shown in Table 1. As shown in this table, the leaf management information is composed of a plurality of leaf management records. This map leaf management record corresponds to the number of map sheets stored in Table 1. The map leaf management information is arranged in order from the one with the highest map leaf level. The child leaves are arranged consecutively.

[Table 3]

Table 4 shows details of the leaf management record shown in Table 3. As shown in Table 4, the leaf level is recorded as the leaf management record. There are levels 0 to 9 in the level of this map leaf, and level 0 represents a map of a reduced scale showing the widest range, and level 9 represents a map of a reduced scale showing the narrowest range. Adjacent map leaves are recorded in the map leaf management record, and this adjacency relationship is defined as shown in FIG. That is, the map leaf number of itself is 5
The upper left of itself is 1, the upper right is 2, the upper right is 3, the left is 4, the right is 6, the lower left is 7, the lower right is 8, and the lower right is 9.

[Table 4]

When the map leaf managed by the map leaf management record is the reference map leaf, there are no child map leaves, so the number of child map leaves is "00h", and the map leaf number of the first child map leaf is "FFFF.
h ".

As for the longitude and latitude of the map leaf, statistics and north latitude are positive, and west longitude and south latitude are negative, respectively. Further, when the scale of the original drawing is 1 / (m × 10 ^e ), as shown in FIG. 9, 3 bits on the MSB side as e and LS as m
Five bits on the B side are used respectively.

As shown in FIG. 7, when there is no map leaf as a route (the map of the widest range) and there are a plurality of map leaves at the same level, a dummy map leaf is assumed as the route, and map leaf number 0 A leaf management record as shown in Table 5 is created. Therefore, the leaf number 0 is reserved for the dummy leaf management record.

[Table 5]

Next, the operation for incorporating a predetermined CD-ROM into the navigation system will be described with reference to the flowchart of FIG. At this time, the user first
Insert the required number of CD-ROMs to be incorporated in the system into magazine 1. The magazine 1 can accommodate, for example, 10 CD-ROMs. in this way,
The magazine 1 containing the CD-ROM is mounted on the CD-ROM driver 2.

First, when the mounting of the magazine 1 is detected in step S1, the process proceeds to step S2 and 0 is set to the variable i. Next, in step S3, the variable i is incremented by 1. In step S4, the variable i is compared with the number N (10 in the embodiment) that can be accommodated in the magazine 1. If the variable i is smaller than or equal to N, the process proceeds to step S5, and it is determined whether or not there is an i-th (in this case, i = 1) disc. That is, the CD-RO is set to the first position of the magazine 1.
It is determined whether M is attached. If it is not attached, the process returns to step S3 and the subsequent processes are repeatedly executed. That is, the position where the CD-ROM is mounted is searched.

If the i-th CD-ROM is installed (the CD-ROM is installed at position i), the process proceeds to step S6 and the CD-ROM is the CD-R.
It is loaded at the reproduction position in the OM driver 2. Then, reproduction is executed, and the format is checked in step S7. This format is determined, for example, from the system identification shown in Table 2. That is, if this system identification is a preset predetermined one, the CD
-ROM is determined to be capable of being integrated into this navigation system. If the format of the CD-ROM is not the preset format, the process returns to step S3 and the subsequent processes are repeated. That is, since the CD-ROM cannot be incorporated in the system, the same processing is performed for the CD-ROM mounted in the next position of the magazine 1.

When it is determined that the format is proper, the process proceeds to step S8, and the identification information of the CD-ROM is read. As this identification information, the volume identification in Table 2 can be used as described above. This identification information is sent to the MPU via the signal processing circuit 3.
6 and is stored in the memory 9. Then step S
In step 9, variable j is set to 1, and in step S10, it is collated with the identification information in the correspondence table shown in table 6. For convenience, in Table 6, numbers such as 1, 2, 3, ... Are used as identification information. The MPU 6 performs step S12 described later.
Through the processing from S15 to S15, the correspondence table as shown in Table 6 is stored in the memory 9.

[Table 6]

In step S11, it is determined whether the identification information read in step S8 matches the identification information shown in Table 6. If the two identifications do not match, the currently loaded CD-ROM has not yet been incorporated into this navigation system. So in this case,
In step S12, the variable j is incremented by 1. Then, in Table 6, C in which the identification information is larger by 1
In step S13, it is determined whether a D-ROM exists. If the CD-ROM of the identification information exists, the process returns to step S10, and the operation of determining whether the identification information of the disc and the identification information read in step S8 match is repeated.

When it is determined in step S13 that there is no CD-ROM having the identification information (Table 6).
If there is no more identification information recorded in), the process proceeds to step S14, the cover area is read from the CD-ROM, and in step S15, the table 6 of the memory 9 is read.
The identification information and the cover area are additionally stored in the correspondence table shown in FIG. That is, by the steps S14 and S15, the identification information of the CD-ROM accommodated in the magazine 1 and the cover area are sequentially additionally stored in the memory 9.

Next, in step S16, the position (accommodation position) of the CD-ROM is recorded at the i-th position of the position table shown in Table 7 stored in the memory 9.

When it is determined in step S11 that the read identification information of the CD-ROM and the identification information stored in the correspondence table shown in Table 6 match, the CD-ROM of the identification information has already been read. It is built into the system. Therefore, in this case, step S
14 and S15 are not executed, the process proceeds to step S16, and only the writing to the position table of Table 7 of the memory 9 is executed. After the process of step S16, the process returns to step S3 again, and the subsequent processes are repeatedly executed.

[Table 7]

As described above, the process ends when all the CD-ROMs mounted in the ten positions of the magazine 1 are incorporated in the system.

As shown in Table 6, each CD-R is included in the correspondence table.
Data of the cover area (range shown on the map) at each scale (level) of the OM is recorded. Also,
In this correspondence table, automatic selection data indicating whether or not the CD-ROM of the identification information can be selected in the automatic mode is also recorded. In Table 6, the CD-ROM whose automatic selection is shown as 0 cannot be selected in the auto mode, and 1 is automatically selected in the auto mode. For a CD-ROM that cannot be read in the auto mode, the CD-ROM can be specified and read by manual operation.

In Table 7, the correspondence between ten positions of the magazine 1 and the identification number of the CD-ROM housed therein is recorded. When a predetermined cover area of a predetermined level is specified from the correspondence table shown in Table 6, the CD-ROM of the identification information can specify the accommodation position in the magazine 1 from the position table shown in Table 7. ..

Next, the operation of displaying a map will be described with reference to the flowchart of FIG. When a predetermined switch of the keyboard 8 is operated to start the operation of the navigation system, the MPU 6 controls the image processing circuit 4 and causes the display device 5 to display a menu screen as shown in FIG. 4, for example. That is, the MPU 6 displays the menu of the map recorded in the CD-ROM incorporated in the system as described above. In this embodiment, maps (CD-ROM) are prepared at 6 positions out of 10 positions.

Of these, the golf map and the escape route map indicated by adding an X at the end are maps that cannot be automatically selected as described above, and when the keyboard 8 is operated to select the number 4 or 6. It is displayed on the display device 5 for the first time. On the other hand, when the auto mode is selected by operating the keyboard 8, the ones in the specified area (including the current position of the car) on the map of Tokyo 23 wards, Kanto, Tohoku and all Japan are automatically read. And is displayed on the display device 5.

When the auto mode is selected, the GP
The S receiver 12 receives the radio wave output from the GPS satellite and detects the current position of the automobile. MPU6 is this G
Corresponding to the current position data supplied from the PS receiver 12, a CD-ROM in which a map of a predetermined level including the current position is recorded is detected from the correspondence table shown in Table 6 stored in the memory 9. Further, the position table shown in Table 7 of the memory 9 is searched for the position in the magazine 1 of the CD-ROM of the identification information including the map. Then, a control signal is output to the MPU 7 to control the CD-ROM driver 2 to load the CD-ROM.

The CD-ROM driver 2 is the loaded C
The map data of the area including the current position of the predetermined level of the D-ROM is reproduced. This reproduction RF signal is input to the signal processing circuit 3 and converted into reproduction data. The image processing circuit 4 processes the reproduced data to convert it into R, G, B color signals, and supplies it to the display device 5 for display. The MPU 6 also controls the image processing circuit 4 so that the vehicle mark is displayed at the current position output by the GPS receiver 12. As a result, a predetermined mark (own vehicle mark) is displayed on the map of the display device 5 where the automobile is currently located
Will be displayed. The user can check the current position by looking at this.

When the navigation system is operating in this way, the processing shown in FIG. 3 is executed.
First, in step S21, it is determined whether or not the current position is within the warning area. That is, as shown in FIG. 5, assuming that the current position is at the position a on the map stored in the disk A, and that this car moves to the position b and then to the position c, the map of the position c is displayed. Is not recorded on the disk A, but is recorded on the disk C. Therefore, it is necessary to switch the disks to be loaded from the disk A to the disk C at a predetermined timing. In order to adjust the timing of this switching time, a warning area shown by hatching in the drawing is provided near the boundary of the area to be covered.

When the current position is within this warning area, the process proceeds from step S21 to step S22 and the variable i
Is set to 0. Further, in step S23, the variable i is incremented by 1 and compared with the number N of disks contained in the magazine 1 in step S24. When the variable i is smaller than or equal to N, the process proceeds to step S26 and the i-th (position i
The identification number of the CD-ROM is checked from the position table in Table 7 of the memory 9. In step S27, the CD-RO is set to that position (in this case, the first position).
When it is determined that M does not exist, the process returns to step S23, the variable i is incremented by 1, and the same process is repeated. That is, only one position has been moved,
The same process is repeated for the next CD-ROM.

If it is determined that the CD-ROM exists at that position, the process proceeds to step S28 and the format of the disc is checked. If the format is not appropriate, the process returns to step S23 and the position is moved to the next position.

If the format is appropriate, the process proceeds to step S29, and the correspondence area shown in Table 6 is used to check the coverage area at the same level as the map currently displayed on the display device 5. For example, when a map of the scale of level 1 is being displayed on the display device 5, a CD which has the same scale and covers the area in the direction in which the vehicle is currently traveling is recorded. -ROM is searched. If there are no maps of the same level in reduced scale, a map of a different level is selected. In step S30, the CD
-If it is determined that the ROM does not include the map of the required cover area, the process returns to step S23, and the same processing is executed for the CD-ROM at the next position.

If it is determined in step S30 that the map of the desired cover area has been retrieved, step S30
Proceeding to step 31, the currently loaded disc is replaced with the retrieved CD-ROM. Further, in step S32, a warning area corresponding to a predetermined level of the cover area of the newly loaded CD-ROM is set.

When it is determined in step S24 that the variable i is smaller than the number N of the CD-ROMs accommodated in the magazine 1, the process proceeds to step S25 and the CD-RO
The M exchange message is displayed on the display device 5. That is, in this case, since the CD-ROM housed in the magazine 1 does not contain the map of the direction in which the vehicle is going, the user is urged to replace the CD-ROM. Of.

The case where the present invention is applied to a navigation system has been described above as an example, but the present invention can be applied to other information retrieval systems.

[0041]

As described above, according to the information retrieval system of claim 1, when a new information recording medium is added, the range and position of the information recorded on the added information recording medium are determined. Since the additional storage is performed, a new information recording medium which is not incorporated in the system can be incorporated in the system at any time. Therefore, it is possible to increase the number of information recording media as needed, so that the system can be constructed at a minimum cost. Then, the system can be upgraded as needed.

According to the navigation system of the second aspect, when a new information recording disk is added, the range of the map information recorded on the added information recording disk is additionally stored at any time. , And read the additionally stored map information corresponding to the current position,
Since it is displayed, if the system itself is common to each region and only the information recording disk is changed for each region in each region, a navigation system can be realized with a minimum system. can do. Therefore, the system can be realized at low cost. Further, in the case of going out from the predetermined area to a different area, it becomes possible to additionally purchase only the information recording medium having the map of the area and incorporate it into the system. Therefore, it is not necessary to prepare a map of all over Japan from the beginning.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a navigation system to which an information search system of the present invention is applied.

FIG. 2 is a flowchart illustrating a routine for creating a correspondence table and a disc position table in the embodiment of FIG.

FIG. 3 is a flowchart illustrating an operation of replacing a CD-ROM in the embodiment of FIG.

FIG. 4 is a diagram illustrating a display example on the display device 5 in the embodiment of FIG.

FIG. 5 is a diagram illustrating a warning area.

FIG. 6 is a diagram illustrating a format of a CD-ROM 21 housed in the magazine 1 in the embodiment of FIG.

FIG. 7 is a diagram illustrating a route of a map in the embodiment of FIG.

FIG. 8 is a diagram illustrating adjacent map leaves of the map in the embodiment of FIG.

FIG. 9 is a diagram illustrating data representing the scale of the map in the embodiment of FIG.

[Explanation of symbols]

 1 Magazine 2 CD-ROM Driver 3 Signal Processing Circuit 4 Image Processing Circuit 5 Display Device 6, 7 MPU 8 Keyboard 9 Memory 10 Detection Device 12 GPS Receiver

Claims (2)

[Claims] 1. A plurality of information recording media on which predetermined information is recorded, a range storage unit for storing a range of information recorded on the plurality of information recording media, and positions of the plurality of information recording media. When a new information recording medium is added, the range of the information recorded on the added information recording medium is additionally stored in the range storing means and is added. An information retrieval system comprising: additional storage means for additionally storing the position of the information recording medium in the position storage means. 2. A plurality of information recording disks on which map information is recorded, a range storing means for storing a range of map information recorded on the plurality of information recording disks, and a new information recording disk is added. The additional information recording disk, the additional storage means for additionally storing the range of map information recorded in the range storage means, the current position detection means for detecting the current position of the vehicle, the current position Searching means for searching the information recording disk on which the map information including the current position detected by the detecting means is recorded, and reading from the information recording disk searched by the searching means; And a display means for displaying map information.